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【单选题】
粉煤灰砌块墙的砌筑方法是( )。
A.
三一砌筑法
B.
灰法
C.
刮浆法
D.
铺灰灌浆法
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【判断题】扑救气体火灾切忌盲目扑灭火势,首先应切断火势蔓延途径,然后疏散火势中压力容器或受到火焰辐射热威胁的压力容器,不能疏散的部署水枪进行冷却保护。()
A.
正确
B.
错误
【单选题】The navigation systems in cars like Lexus, BMW and Audi are mentioned to show ______.
A.
the immaturity of the new technology
B.
the superiority of the global positioning system
C.
the cause of price fluctuations in car equipment
D.
the different ways of providing guidance to the driver
【简答题】什么是雪崩倍增效应?
【单选题】EDFA是利用以下哪个()原理实现
A.
自发辐射
B.
受激吸收
C.
受激辐射
D.
雪崩倍增效应
【单选题】Cars are mentioned in Paragraph 2 to show ________.
A.
the Internet can provide maps to guide drivers in traffic jams
B.
people can solve air pollution and traffic jams by using the Internet
C.
the Internet, like cars, brings convenience and causes problems at the same time
D.
the negative effects they cause
【判断题】雪崩倍增效应是一种随机过程,会造成额外的噪声,此外还会造成响应速度的降低。
A.
正确
B.
错误
【单选题】All of the following are mentioned in Paragraph 2 as contributing to how cars cause air pollution EXCEPT that______.
A.
the brakes on cars give off asbestos bad for health
B.
car combustion emits poisonous chemicals
C.
catalytic converters also produces poisonous chemicals
D.
tires give off small rubber particles harmful to health
【简答题】直接写出得数 3.05×1000= 125×8= 84+0÷16= 156-28-72= 9.1÷10= 56+= 900÷25÷4= 37+63×0=
【判断题】APD 是利用雪崩倍增效应使一次光生电流获得放大的高灵敏度探测器。
A.
正确
B.
错误
【单选题】()就是利用雪崩效应使光电流得到倍增的高灵敏度的检测器。
A.
发光二极管
B.
APD雪崩光电二极管
C.
双基极二极管
D.
混频二极管
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